Every detectorist has a drawer full of them. Flat lead discs, usually with a hole or two, sometimes with letters, numbers, or strange symbols. They're not coins. They're not buttons. They give a good signal and come up clean, but nobody seems to know what they are.
Let me introduce you to cloth seals — also called bale seals, clothiers' marks, or lead tokens. They're among the most common medieval and post-medieval finds in Britain, and almost nobody understands them. That changes today.
From the 13th to the 19th century, cloth was big business in Britain. Wool was our primary export — so important that the Lord Chancellor still sits on a woolsack in Parliament. The cloth trade made fortunes, built towns, and required serious quality control.
That's where seals came in. Every stage of cloth production — from weaving to dyeing to measuring to export — was marked with a lead seal attached to the fabric. These seals were quality marks, tax receipts, origin certificates, and trade tokens all in one. A single bolt of cloth might accumulate half a dozen seals before reaching its final buyer.
And when the cloth was cut, what happened to the seals? They fell on the floor. They got swept into the gutter. They ended up in the fields where we find them centuries later.
The most common type. Two discs connected by a strip of lead that was folded through the cloth and hammered shut. When you find just one disc with a connecting strip bent at an angle, you've got half of a two-part seal. The other disc is probably nearby — or was lost separately when the seal was removed.
These typically show a design on one side (often a coat of arms or merchant's mark) and initials or numbers on the other.
Stamped lead discs with a hole for a cord or wire. These were tied onto cloth rather than riveted through it. Often simpler designs — just initials, a date, or a town mark.
The tax seals. "Alnage" comes from the French "aulne" (ell), the standard measurement for cloth. From the 14th century, royal officials called "alnagers" measured cloth and attached seals confirming the correct size and quality had been verified — and that the tax had been paid.
Alnage seals often show a royal coat of arms or crown. Finding one means you've found proof of medieval bureaucracy in action.
Specific trades left their marks. Dyers' seals certified the colour was fast and true. Fullers' seals confirmed the cloth had been properly cleaned and thickened. These often show tools of the trade — shears, tenter hooks, or dye vats.
The fancy ones. Wealthy cloth merchants had personal marks — stylised monograms combining their initials with geometric designs. These evolved into proper heraldry for the rising merchant class. If you find a seal with an elaborate personal mark, you're looking at the branding of a Tudor or Stuart entrepreneur.
Here's where it gets interesting. Cloth seals are like miniature history books, if you know how to read them.
Town names: Many seals bear abbreviated town names. "COL" for Colchester. "NOR" for Norwich. "EXON" for Exeter. These tell you where the cloth was made or inspected.
Initials: Usually the clothier, merchant, or inspector. Sometimes three initials (a married man's mark including his wife's maiden name initial — common practice).
Numbers: Often measurements or batch numbers. A "12" might indicate twelve yards of cloth. "1638" is probably a date.
Crowns and coats of arms: Royal authorisation. The seal was applied by a licensed official, not just the merchant.
Stars, crosses, and symbols: Guild marks or quality grades. A star might mean first-grade wool. A cross might indicate cloth suitable for export.
Cloth seals turn up everywhere, but some locations produce them in quantity:
If you're finding clusters of cloth seals, you've probably identified a site with historical textile activity. That's useful information for targeting your search.
Lead gives a distinctive signal — high conductivity, soft response. On most machines, cloth seals read in the upper range, sometimes confusingly close to copper or silver.
On a Minelab Equinox: typically 25-35 VDI. On an XP Deus 2: often 85-95. The shape (flat disc) gives a clean, repeatable signal.
The challenge is distinguishing cloth seals from other lead items — fishing weights, window came, musket balls, and random offcuts. Depth helps: cloth seals are typically shallow (they're only a few centuries old), while Roman lead tends to be deeper.
Cloth seals are more than curiosities. They're data points for economic history.
A seal from Colchester found in a Kent field tells us about Tudor trade routes. A cluster of dyers' seals in a village indicates a lost industry. A merchant's mark can sometimes be traced to specific families in historical records.
The Portable Antiquities Scheme welcomes cloth seals. Each recorded find adds to our map of Britain's textile trade — who made what, where it went, and how commerce flowed across the country.
Several resources can help:
Every cloth seal you find represents work. A weaver spent weeks at the loom. A fuller trampled the fabric in troughs of urine and clay. A dyer stirred steaming vats of indigo or woad. An inspector checked measurements and hammered on the seal.
Then a merchant bought the cloth, shipped it across the country, and sold it to someone who made it into clothes, hangings, or sails. The seal fell off and lay in the mud until you came along with your detector.
Cloth seals aren't glamorous finds. They won't make headlines. But they connect you directly to the everyday economy that built medieval and Tudor Britain — an economy of wool, work, and trade that shaped our towns, our wealth, and our history.
Next time you pull a flat lead disc from the soil, give it a proper look. Those mysterious letters and symbols have a story to tell. And now you know how to read it.
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